Humidity

[Don]

Hi Jere,

Humidity change of 5% may cause a pitch change of 4 cents at A4 on some
small uprights such as the Yamaha P2. The first plain steel wire may often
be the most unstable, and the first note below the bass break may be the
most stable. In addition the unisons may "smear" with the shortest pin to
pressure bar moving most.

There is no "hard" research--just a couple of "lucky" accidents where
humidity control systems were unplugged at times of the year that showed
these results.

I'm the original poster to the listserv for this empirical data. Please
have a look at my web site and the article "Fine Tuning The Environment For
Pianos". 

At 07:59 PM 10/10/2006 -0500, you wrote:
>List,
>
>Sometime in the past someone wrote about how humidity changes affect pitch 
>changes.  In the article they said that for every % in humidity change the 
>pitch changes by a certain amount also.  I have been searching the archives 
>and I can't find those figures.  Does anyone know how much the pitch will 
>change with every % of humidity change?
>
>I need this to make a point at our local college.
>
>Jere

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

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